Vehicle seat

ABSTRACT

There is provided a vehicle seat including: a seat main body having a major surface facing a user seated; a first air passage extending from an air conditioning device of a vehicle toward the seat main body so as to guide air from the air conditioning device to the seat main body; an outlet communicating with the first air passage and opened toward a first region of the major surface through the seat main body; a second air passage having an inlet which is opened toward a second region of the major surface through the seat main body so as to suck air from the second region; and a blower configured to suck air in the second air passage.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority from Japanese Patent Application No. 2015-106639 filed on May 26, 2015, the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a vehicle seat mounted on a vehicle such as an automobile, a train and an airplane.

BACKGROUND

JP-A-H05-213056 discloses an air conditioning device for a seat provided in an automobile. The seat has a seat cushion, a seat back coupled to a rear portion of the seat cushion, and a headrest coupled to an upper portion of the seat back. The air conditioning device has an outlet in an upper portion of the headrest and an inlet in a side portion of the seat back and a side portion of the seat cushion. The outlet is configured to blow out cold air or warm air downward from the upper portion of the headrest. The inlet is opened upward in the side portion of the seat cushion or opened laterally in the side portion of the seat back such that there is no hindrance to a user seated on the seat.

By using a blower fan provided at a lower side of the seat, air is sucked from the inlet via an intake duct. The air is cooled or warmed by a cooler or heater provided at the downstream of the blower fan. The cold air or warm air is blown out from the outlet via a discharge duct and is again sucked from the inlet. Therefore, the surroundings of the user seated on the seat can be intensively air-conditioned. Further, a heat exchanger is also provided for performing the heat exchange between the cold air or warm air passing through the discharge duct and the air passing through the intake duct. In this way, the seat can be cooled or heated by using the intake duct.

However, a technique of warming or cooling a user seated on a seat by using a method different from related art or using a smaller energy has been demanded.

SUMMARY

According to an aspect of the present disclosure, there is provided a vehicle seat including: a seat main body having a major surface facing a user seated; a first air passage extending from an air conditioning device of a vehicle toward the seat main body so as to guide air from the air conditioning device to the seat main body; an outlet communicating with the first air passage and opened toward a first region of the major surface through the seat main body; a second air passage having an inlet which is opened toward a second region of the major surface through the seat main body so as to suck air from the second region; and a blower configured to suck air in the second air passage.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view of a vehicle seat;

FIG. 2 is a sectional view taken along a line II-II shown in FIG. 1;

FIG. 3 is a plan view of the vehicle seat; and

FIG. 4 is a sectional view taken along a line IV-IV shown in FIG. 1.

DETAILED DESCRIPTION

An embodiment of the present disclosure will be described with reference to FIGS. 1 to 4. As shown in FIG. 1, a vehicle seat 1 is mounted on a floor 41 of a vehicle such as an automobile, a train, an airplane and a vessel. The vehicle seat 1 has a seat cushion 2 for supporting a hip of a user 40 (see FIG. 4) and a seat back 3 for supporting a back of the user 40.

As shown in FIGS. 1 and 2, the seat cushion 2 has a frame 2 a, a pad 2 b mounted on the frame 2 a and a seat cover 2 c covering the pad 2 b. The frame 2 a has a rectangular frame main body extending along an outer periphery of the seat cushion 2 and an elastic member suspended from the frame body and elastically supporting the pad 2 b. The pad 2 b is formed of foam urethane or the like. The seat cover 2 c is made of fabric or leather.

As shown in FIGS. 1 and 2, the seat back 3 has a frame 3 a, a pad 3 b mounted on the frame 3 a and a seat cover 3 c covering the pad 3 b. The frame 3 a has a rectangular frame main body extending along an outer periphery of the seat back 3 and an elastic member suspended from the frame body and elastically supporting the pad 3 b. A lower portion of the frame 3 a is coupled, in an angle adjustable manner, to a rear portion of the frame 2 a of the seat cushion 2 by a recliner 8.

As shown in FIG. 1, the seat cushion 2 is longitudinally movably attached to the floor 41 by two slide devices 4. The slide device 4 has a lower rail 4 a, an upper rail 4 b slidably attached to the lower rail 4 a and a bracket 4 c attaching the lower rail 4 a to the floor 41. The upper rail 4 b slides relative to the lower rail 4 a by an actuator 4 d. The actuator 4 d has a motor which is controlled by a switch 6. Therefore, the operation of the switch 6 allows the vehicle seat 1 to move longitudinally relative to the floor 41.

As shown in FIG. 1, the switch 6 is provided to a side shield 5. The side shield 5 is attached to a side portion of the seat cushion 2 and covers a lower region of the side portion of the seat cushion 2. In this way, the design of the vehicle seat 1 is improved. A plurality of switches 6 is provided in the side shield 5. The recliner 8 is controlled by one switch 6, so that an angle of the seat back 3 relative to the seat cushion 2 can be adjusted. A lifter (not shown) is provided in the seat cushion 2. The lifter is controlled by one switch 6, so that a height of the seat cushion 2 can be adjusted.

As shown in FIG. 1, a front shield 7 is provided to the front portion of the seat cushion 2. The front shield 7 is attached to the seat cushion 2 and covers a lower region of the front portion of the seat cushion 2. In this way, the design of the vehicle seat 1 is improved.

As shown in FIGS. 1 to 3, a mechanism for warming or cooling the user 40 by using air from an air conditioning device 10 is provided in the seat cushion 2 and the seat back 3. The air conditioning device 10 is provided in a main body of a vehicle, such as an engine room of an automobile. The air conditioning device 10 receives air, cools or warms the air and blows out the air to the interior of the vehicle. A guide duct 11 for guiding the air exhausted from the air conditioning device 10 to the vehicle seat 1 is coupled to the air conditioning device 10. One end of the guide duct 11 is coupled to the air conditioning device 10 and the other end thereof is coupled to a distributor 12 attached to a lower side of the seat cushion 2.

As shown in FIGS. 2 and 3, a discharge duct 13 is coupled to the distributor 12. The discharge duct 13 has a pipe 13 a extending from the distributor 12 and a hole 13 b formed in the pad 2 b. The hole 13 b has an outlet 13 c facing the seat cover 2 c. The outlet 13 c is located at a central region of the rear portion of the seat cushion 2. The pad 2 b may be provided with one outlet 13 c elongated in a left-right direction or may be provided with a plurality of outlets 13 c arranged in the left-right direction. The central region of the rear portion of the seat cushion 2 is a first region 2 e which receives a relatively high pressure when the user 40 is seated on the seat cushion 2 (see FIG. 1).

As shown in FIGS. 3 and 4, a discharge duct 14 is coupled to the distributor 12. The discharge duct 14 extends from the distributor 12 toward the side portion of the seat cushion 2, specifically, toward the front portion of the side shield 5. The discharge duct 14 is coupled to a second duct 15 extending longitudinally along an upper portion of the side shield 5. The second duct 15 is communicating with a plurality of first outlets 16 formed in the upper portion of the side shield 5.

As shown in FIGS. 3 and 4, the first outlets 16 are opened upward. Therefore, the air from the air conditioning device 10 (see FIG. 2) is blown out upward along the side portion of the seat cushion 2 from the first outlets 16 (primary air stream A). The air along the side portion of the seat cushion 2 flows along the side portion and upper surface of the seat cushion 2 or the user 40 by a Coanda effect. In this way, the air from the air conditioning device 10 is blown to the vicinity of the user 40. The first outlets 16 and the side shield 5 are provided at both left and right sides of the seat cushion 2.

As shown in FIG. 3, a discharge duct 17 is coupled to the distributor 12. The discharge duct 17 extends from the distributor 12 toward the side portion of the seat back 3. A first outlet 18 is coupled to an end portion of the discharge duct 17. As shown in FIG. 1, the first outlet 18 is provided in the side portion of the seat back 3. The first outlet 18 has an opening 18 a which is vertically elongated along the side portion of the seat back 3 and opened forward. Therefore, the air from the air conditioning device 10 (see FIG. 2) is blown out forward along the side portion of the seat back 3 from the first outlet 18 (primary air stream A). The air flows along the side portion and front surface of the seat back 3 or the user 40 by the Coanda effect. In this way, the air from the air conditioning device 10 is blown to the vicinity of the user 40. The first outlet 18 is provided at both left and right sides of the seat back 3.

As described above, the air from the air conditioning device 10 (see FIG. 2) is blown to the user 40 through the seat cover 2 c from the outlet 13 c in the rear portion of the seat cushion 2. Furthermore, the air from the air conditioning device 10 is also blown out from the first outlets 16 in the side portion of the seat cushion 2 and the first outlets 18 in the side portion of the seat back 3 (air stream D shown in FIG. 1). Therefore, the air from the air conditioning device 10 is primarily blown out toward the user 40 from the vehicle seat 1.

As shown in FIGS. 1 and 2, a structure for sucking the air blown out is provided in the seat cushion 2 and the seat back 3. A hole 22 penetrating in a thickness direction is formed in the pad 2 b of the seat cushion 2. The hole 22 has an inlet 22 a facing the seat cover 2 c. A plurality of holes 22 is provided in a major surface 2 d of the seat cushion 2. The major surface 2 d is a region which faces the user 40 when the user 40 is seated on the vehicle seat 1. Specifically, the major surface 2 d is a region excluding the left and right regions on the upper surface of the seat cushion 2. The left and right regions are bulged upward from the major surface 2 d. Meanwhile, the holes 22 may be provided also in the left and right regions.

As shown in FIG. 1, the major surface 2 d receives a pressure when the user 40 is seated. The major surface 2 d has a first region 2 e which receives a high pressure from the user 40 and a second region 2 f which receives a pressure lower than that of the first region 2 e. The first region 2 e is a portion corresponding to a portion under a hip of the user 40, for example. The second region 2 f is a portion of the major surface 2 d other than the first region 2 e.

As shown in FIGS. 1 and 2, the holes 22 are arranged in multiple rows in a longitudinal direction and in multiple rows in a lateral direction in the second region 2 f of the seat cushion 2. The outlet 13 c is provided in the first region 2 e. The other ends 22 b of the holes 22 are coupled to an intake duct 23. The intake duct 23 covers the lower surface of the pad 2 b and communicates with each hole 22. The intake duct 23 is provided with a blower 21. The blower 21 has a fan which is rotated by a motor. Together with the air conditioning device 10 or separately from the air conditioning device 10, the motor is controlled by a controller (not shown).

As shown in FIG. 2, the blower 21 sucks air from the intake duct 23 and discharges the air to the second duct 20. Two second outlets 25 are provided at a leading end of the second duct 20. When the fan of the blower 21 rotates, the air is sucked from the inlets 22 a through the seat cover 2 c. The air is sucked to the blower 21 through the holes 22 and the intake duct 23. The blower 21 discharges the air to the second outlets 25 via the second duct 20.

As shown in FIG. 1, the second outlets 25 are located at the lower region of the front portion of the seat cushion 2. Specifically, the second outlets 25 are respectively provided in the front shield 7 and located at both left and right sides of the front portion of the seat cushion 2. The second outlets 25 are opened forward and, preferably, opened toward the back side of the left and right calf of the user 40.

When air is discharged from the air conditioning device 10, the air is blown out toward the user 40 from the first outlets 16 on the side portion of the seat cushion 2, as shown in FIG. 1 (primary air stream A). As the fan of the blower 21 rotates, the air in the primary air stream A is sucked from the holes 22 (secondary air stream B). Therefore, the air blown out from the first outlets 16 can flow toward the user 40 by the secondary air stream B without being spread. In this way, the cold or warm air from the air conditioning device 10 can effectively cool or warm the user 40.

As shown in FIG. 2, the holes 22 are oriented toward the user 40. Therefore, the air in contact with the user 40 is sucked from the holes 22. In this way, during cooling, heat is removed from the user 40 through air, and hence, the user 40 can be cooled. The air discharged from the blower 21 is blown out from the second outlets 25 via the second duct 20 (tertiary air stream C). The second outlets 25 are oriented toward legs of the user 40. Therefore, when warm air is blown from the second outlets 25, the calf of the user can be warmed by receiving heat from the warm air. When cold air is blown, the calf is cooled by heat being removed by the cold air. Furthermore, the calf can lose its heat by wind.

As shown in FIGS. 1 and 2, a hole 31 penetrating in a thickness direction is formed in the pad 3 b of the seat back 3. The hole 31 has an inlet 31 a facing the seat cover 3 c. A plurality of holes 31 are provided in a major surface 3 d of the seat back 3. The major surface 3 d is a region facing the user 40 when the user 40 is seated on the vehicle seat 1. Specifically, the major surface 3 d is a region pother than the left and right regions on the front surface of the seat back 3. The left and right regions are bulged forward from the major surface 3 d. The major surface 3 d receives a pressure when the user 40 is seated.

As shown in FIGS. 1 and 2, the holes 31 are arranged in multiple rows in a vertical direction and in multiple rows in a lateral direction in the major surface 3 d of the seat back 3. The other ends 31 b of the holes 31 are coupled to an intake duct 32. The intake duct 32 covers the rear surface of the pad 3 b and communicates with each hole 31. The intake duct 32 is provided with a blower 30 shown in FIG. 3. The blower 30 has a fan which is rotated by a motor. Together with the air conditioning device 10 or separately from the air conditioning device 10, the motor is controlled by a controller (not shown).

The blower 30 shown in FIG. 3 sucks air from the intake duct 32 shown in FIG. 2 and discharges the air to the second duct 33. Two second outlets 34 are provided in a leading end of the second duct 33. When the fan of the blower 30 rotates, the air is sucked from the inlets 31 a through the seat cover 3 c. The air is sucked to the blower 30 through the holes 31 and the intake duct 32. The blower 30 discharges the air from the second outlets 34 via the second duct 33.

As shown in FIGS. 1 and 3, the second outlets 34 are located at the left and right on the upper side of the seat back 3. The upper portion of the seat back 3 faces upward, and left and right headrest brackets 3 f are provided at the central region of the upper portion. Struts of a headrest (not shown) are inserted into the headrest brackets 3 f to support the headrest relative to the seat back 3. The left and right second outlets 34 are located at the outside of the left and right headrest brackets 3 f, respectively. The second outlets 34 are opened to the front and toward the width center of the seat 1, as shown in FIGS. 1 and 3. Preferably, the second outlets are opened toward a neck of the user 40 from above shoulders of the user 40 seated on the seat 1.

When air is discharged from the air conditioning device 10, the air is blown out toward the user 40 from the first outlets 18 on the side portion of the seat back 3, as shown in FIG. 1 (primary air stream A). As the fan of the blower 30 rotates, the air in the primary air stream A is sucked from the holes 31 (secondary air stream B). Therefore, the air blown out from the first outlets 18 can flow toward the user 40 by the secondary air stream B without being spread. In this way, the cold or warm air from the air conditioning device 10 can effectively cool or warm the user 40.

As shown in FIG. 2, the holes 31 are oriented toward the user 40. Therefore, the air in contact with the user 40 is sucked from the holes 31. In this way, during cooling, heat is removed from the user 40 through air, and hence, the user 40 can be cooled. As shown in FIGS. 1 and 3, the air discharged from the blower 30 is blown out from the second outlets 34 via the second duct 33 (tertiary air stream C). The second outlets 34 are oriented toward the neck of the user. Therefore, when warm air is blown from the second outlets 34, the neck of the user can be warmed by receiving heat from the warm air. When cold air is blown, the neck is cooled by heat being removed by the cold air. Furthermore, the neck can also lose its heat by wind. Here, the neck tends to feel the temperature, as compared with other regions of the body. Accordingly, the user can feel to be cooled or warmed with relatively little energy. 1

As shown in FIG. 1, the vehicle seat described above includes a seat main body (the seat cushion 2 and the seat back 3) having the major surfaces 2 d, 3 d facing the user 40 seated. As shown in FIGS. 2 and 3, the vehicle seat further includes the first air passage, the outlets 16, 18 and the second air passage. The first air passage (the guide duct 11) extends from the air conditioning device 10 of a vehicle toward the seat main body so as to guide air from the air conditioning device 10 to the seat main body. As shown in FIG. 3, the outlets 16, 18 are provided to the side portion of the seat main body and opened so that the air from the first air passage is blown out along the side portion of the seat main body. The second air passage (the holes 22, 31 and the intake ducts 23, 32) has the inlets 22 a, 31 a opened toward the major surfaces 2 d, 3 d such that the air blown out from the outlets 16, 18 is sucked from the major surfaces 2 d, 3 d. The air in the second air passage is sucked by the blowers 21, 30.

Therefore, as shown in FIGS. 1 and 2, the air cooled or warmed in the air conditioning device 10 is blown out from the outlets 16, 18 via the first air passage. The outlets 16, 18 are configured to blow out the air along the side portion of the seat main body. Since the air flows along the side portion of the seat main body, there occurs a Coanda effect that air flows along a wall. Thus, the air flows along the side portion of the seat main body and also flows toward the major surfaces 2 d, 3 d. The air blown out from the outlets 16, 18 can be sucked from the inlets 22 a, 31 a opened on the major surfaces 2 d, 3 d. Thus, the air blown out can be blown in such a way that the air is directed toward the user 40 or goes round the user 40. In this way, the user 40 is enveloped by the cold air or warm air. This state is similar to a state where the user 40 is covered by an air curtain. Thus, the user 40 is primarily effectively cooled or warmed by the cold air or warm air from the air conditioning device 10 (primary cooling or primary warming).

Furthermore, the air is sucked from the inlets 22 a, 31 a opened on the major surfaces 2 d, 3 d facing the user 40. Therefore, the air present in a narrow gap between the user 40 and the major surfaces 2 d, 3 d is sucked from the inlets 22 a, 31 a. In this way, it is possible to take heat from the user 40 through the air. Thus, during cooling, the user 40 can be cooled by using the air sucked from the major surfaces 2 d, 3 d (secondary cooling).

As shown in FIGS. 1 and 3, the seat main body has the seat cushion 2 configured to support a hip of the user 40 and the seat back 3 provided to a rear portion of the seat cushion 2 and configured to support a back of the user 40. The second outlets 25 are provided in the seat cushion 2 such that the air discharged from the blower 21 is blown out to the front of the seat cushion 2. Generally, a calf of a user is located in front of the seat cushion 2. Therefore, the calf of the user can be tertiarily cooled or secondarily warmed by the cold air or warm air blown out from the second outlets 25.

As shown in FIGS. 1 and 3, the second outlets 34 opened forward are provided in the upper portion of the seat back 3 such that the air discharged from the blower 30 is blown out forward from the upper portion of the seat back 3. Generally, a neck of a user is located in front of the upper portion of the seat back 3. Therefore, the neck of the user 40 can be tertiarily cooled or secondarily warmed by the cold air or warm air blown out from the second outlets 34.

As shown in FIG. 1, the vehicle seat 1 described above includes a seat main body having the major surfaces 2 d, 3 d and seat outer peripheries 2 g, 3 g located at the outer peripheries of the major surfaces 2 d, 3 d. The vehicle seat 1 further includes the first air passage, the first outlets 16, 18, the second air passage and the second outlets 25, 34, as shown in FIGS. 1 to 3. The first outlets 16, 18 are provided in the seat outer peripheries 2 g, 3 g, so that the air from the first air passage is blown out from the seat outer peripheries 2 g, 3 g. The second outlets 25, 34 are configured to blow out the air discharged from the blowers 21, 30 toward the user 40.

Therefore, the air cooled or warmed in the air conditioning device 10 is blown out from the first outlets 16, 18 to the seat outer peripheries 2 g, 3 g via the first air passage. The air blown out from the first outlets 16, 18 can be sucked from the inlets 22 a, 31 a opened on the major surfaces 2 d, 3 d. Therefore, the air blown out can be blown to the user 40 without being greatly spread.

As shown in FIGS. 2 and 3, the air, which is sucked from the inlets 22 a, 31 a and discharged from the blowers 21, 30, is again blown out toward the user. Therefore, the cold air or warm air from the air conditioning device 10 is again utilized for cooling or warming the user (tertiary cooling or secondary warming). Thus, the cold air from the air conditioning device 10 is utilized three times when cooling the user 40. That is, the cold air blown out from the first outlets 16, 18 cools the user 40, the air sucked from the major surfaces 2 d, 3 d of the seat main body takes heat from the user 40, and the cold air is additionally blown to the user 40. The warm air from the air conditioning device 10 is utilized two times for warming the user 40. That is, the warm air discharged from the first outlets 16, 18 warms the user 40 and the warm air sucked from the major surfaces 2 d, 3 d of the seat main body is additionally blown to the user 40. Thus, the cold air or warm air from the air conditioning device 10 can be effectively utilized to cool or warm the user 40.

As shown in FIG. 1, the vehicle seat 1 includes the seat main body (the seat cushion 2) having the major surface 2 d facing the user 40 seated. The vehicle seat 1 further includes the first air passage, the outlet 13 c and the second air passage. The first air passage (the guide duct 11) extends from the air conditioning device 10 of a vehicle toward the seat main body so as to guide air from the air conditioning device 10 to the seat main body. The outlet 13 c is communicating with the first air passage and opened toward the first region 2 e of the major surface 2 d through the seat main body. The second air passage has the inlet 22 a which is opened toward the second region 2 f through the seat main body so as to suck air from the second region 2 f of the major surface 2 d. The air in the second air passage is sucked by the blower 21.

Therefore, two lines of air stream occur in the seat main body. One line is an air stream flowing from the air conditioning device 10 to the major surface 2 d of the seat main body. Another line is an air stream in which air is sucked to the seat main body from the major surface 2 d by the blower 21. In the first region 2 e of the major surface 2 d, the cold air or warm air from the air conditioning device 10 is directly blown to the user 40. In the second region 2 f of the major surface 2 d, the air in the surroundings of the user 40 is sucked by the second air passage.

Therefore, during cooling, in the first region 2 e, the cold air from the air conditioning device 10 is directly blown to the user 40. Furthermore, the first region 2 e itself can be cooled by the cold air. In the second region 2 f, the air in the surroundings of the user 40 is sucked. In this way, it is possible to take heat from the user 40 through the air, thereby cooling the user 40. Further, generally, the air conditioning device 10 discharges cold air after a predetermined time has elapsed from the start-up. Therefore, in the first region 2 e using the air conditioning device 10, an effect of cooling the user 40 is small immediately after the start-up of the air conditioning device 10. After a predetermined time has elapsed, the user 40 can be effectively cooled by the cold air. On the other hand, in the second region 2 f where the air is sucked, since the air sucked takes heat from the user 40, the user can be cooled immediately. Thus, the user 40 can be cooled immediately by the second region 2 f and can be also cooled by the cold air from the first region 2 e after a predetermined time has elapsed.

During warming, in the first region 2 e, the warm air from the air conditioning device 10 is directly blown to the user 40. Furthermore, the first region 2 e itself can be warmed by the warm air. The air in the surroundings of the user 40 is sucked in the second region 2 f. Therefore, heat is removed from the user 40 through the air. In this way, a temperature difference between the first region 2 e and the second region 2 f, which is felt by the user 40, is increased. Generally, when there is a temperature difference, the warmth in the first region 2 e can be more strongly felt. Therefore, it is possible to allow the user 40 to strongly feel the warmth.

When the user 10 is seated on the seat main body, the pressure which the first region 2 e receives from the user 10 is higher than a pressure which the second region 2 f receives from the user 10. Generally, in a higher pressure region, more energy is necessary when the air is sucked than when the air is blown out. Therefore, the air is blown out from the first region 2 e which receives a relatively high pressure, and the air is sucked in the second region 2 f which receives a lower pressure. In this way, the air can be blown out from and sucked in the major surface 2 d with relatively small energy.

The seat main body has the seat cushion 2 configured to support a hip of the user 40 and the seat back 3 provided to a rear portion of the seat cushion 2 and configured to support a hack of the user 40. The first region 2 e is located at the rear portion of the seat cushion 2 and under the hip of the user 40. Generally, the first region 2 e under the hip receives a relatively high pressure. Further, in the region receiving a higher pressure, more energy is necessary when the air is sucked than when the air is blown out. Therefore, the air is blown out from the first region 2 e which receives a relatively high pressure, and the air is sucked in the second region 2 f which receives a lower pressure. In this way, the air can be blown out from and sucked in the major surface 2 d with relatively small energy.

Although the embodiment of the present disclosure has been described with reference to the above-described structure, it is apparent to those skilled in the art that many substitutions, improvements and modifications can be made without departing from the object of the present disclosure. Therefore, the embodiment of the present disclosure can include all of the substitutions, improvements and modifications which do not depart from the spirit and object of appended claims. For example, the embodiment of the present disclosure is not limited .to the above-described structure but can be modified as follows.

As described above, an air flowing structure for generating the primary air stream A, the secondary air stream B and the tertiary air stream C is provided to each of the seat cushion 2 and the seat back 3. Instead of this, an air flowing structure may be provided to only one of the seat cushion 2 and the seat back 3.

The second air passage has the holes 22, 31 of the pads 2 b, 3 b and the intake ducts 23, 32, as shown in FIG. 2. The second air passage may have a pipe penetrating the pads 2 b, 3 b, instead of the holes 22, 31. The second air passage may have a groove which is formed in the pads 2 b, 3 b for communicating respective holes 22, 31, instead of the intake ducts 23, 32.

As shown in FIGS. 1 and 3, the second outlets 25 are provided in the front portion of the seat cushion 2 and opened forward such that the air discharged from the blower 21 is blown out toward the calf of the user 40. Instead of or in addition to this, the second outlets may be provided in the seat cushion 2 such that the air is blown out toward the other portions of the user. For example, the second outlets may be provided to the side portion of the seat cushion 2 and have an opening opened upward such that the air is blown out toward the arms of the user. In order to blow out the air toward the back of the knee of the user, the second outlets may be provided to the side portion or the front portion of the seat cushion 2 and have an opening opened upward.

As shown in FIGS. 1 and 3, the second outlets 34 are provided in the left and right on the upper side of the seat back 3 and opened to the front and toward the width center such that the air discharged from the blower 30 is blown out toward the neck of the user 40. Instead of or in addition to this, the second outlets may be provided in the seat back 3 such that the air is blown out toward the other portions of the user. For example, the second outlets may be provided in the rear portion of the seat back 3 and have an opening opened forward such that the air is blown out toward the arms of the user.

As shown in FIGS. 1 and 3, the second outlets 25, 34 are configured to blow out the air discharged from the blowers 21, 30 toward the user 40 seated on the seat 1. Instead of or in addition to this, the seat 1 may be provided with the second outlets for blowing out the air toward the seat 1 or a rear user seated on a rear seat located on the rear of the seat main body. For example, the second outlets may be provided in the rear portion of the seat cushion 2 and have an opening opened rearward. The second outlets may be provided in the lower portion of the seat back 3 and have an opening opened rearward.

As shown in FIGS. 1 and 3, the first outlets 16, 18 for primarily blowing out the air supplied from the air conditioning device 10 are provided to the side portion of the seat cushion 2 or the seat back 3. Instead of or in addition to this, the first outlets may be provided to the other portions of the seat outer peripheries 2 g, 3 g of the seat cushion 2 or the seat back 3. For example, the first outlets may be provided to the front portion of the seat cushion 2 to blow out the air upward along the front portion. The first outlets may be provided in the upper portion of the seat back 3, for example, at the same position as or in proximity to the second outlets 34 to blow out the air forward along the upper portion.

A heater having a heating wire may be provided in the seat cushion 2 and/or the seat back 3. The heater can be provided between the pads 2 b, 3 b and the seat covers 2 c, 3 c. Generally in order to discharge the warm air, the air conditioning device 10 requires a predetermined time from the start-up. By using the heater during the predetermined time, the seat cushion 2 or the seat back 3 can be relatively quickly warmed. When the warm air is discharged from the air conditioning device 10, the heater may be utilized. In this case, the air sucked from the holes 22, 31 is warmed by the heater. Therefore, the air temperature of the tertiary air stream C, which is sucked from the holes 22, 31 and discharged from the second outlets 25, 34, is increased. Thus, the user can be reliably warmed by the tertiary air stream C.

As described above, the seat cushion 2 is provided with the outlet 13 c opened toward the first region 2 e of the major surface 2 d. The first region 2 e is located under the hip of the user 40. Instead of or in addition to this, the seat cushion may be provided with an outlet opened toward the other regions of the major surface 2 d. For example, the outlet may be provided in a region (first region) of the major surface 2 d, which is located under the calf of the user 40. In this way, the cold air or warm air from the air conditioning device 10 can be directly blown to the calf of the user 40. Here, the region located under the calf is a region which receives, from the user 40, a pressure higher than that of the other regions of the major surface 2 d.

The seat cushion 2 is provided with the outlet 13 c opened toward the first region 2 e of the major surface 3 d. Instead of or in addition to this, the seat back 3 may be provided with an outlet opened toward the major surface 3 d. For example, the seat back may be provided with the outlet opened toward a region corresponding to a waist of a user. In this way, the cold air or warm air from the air conditioning device 10 can be directly blown to the waist of the user 40. Here, the region corresponding to the waist is a region which is receives, from the user 40, a pressure higher than that of the other regions of the major surface 3 d. 

What is claimed is:
 1. A vehicle seat comprising: a seat main body having a major surface facing a user seated; a first air passage extending from an air conditioning device of a vehicle toward the seat main body so as to guide air from the air conditioning device to the seat main body; an outlet communicating with the first air passage and opened toward a first region of the major surface through the seat main body; a second air passage having an inlet which is opened toward a second region of the major surface through the seat main body so as to suck air from the second region; and a blower configured to suck air in the second air passage.
 2. The vehicle seat according to claim 1, wherein, when the user is seated on the seat main body, a pressure which the first region receives from the user is higher than a pressure which the second region receives from the user.
 3. The vehicle seat according to claim 1, wherein the seat main body has a seat cushion configured to support a hip of the user and a seat back provided to a rear portion of the seat cushion and configured to support a back of the user, and wherein the first region is located at the rear portion of the seat cushion and under the hip of the user.
 4. The vehicle seat according to claim 1, wherein the seat main body has a seat cushion configured to support a hip of the user and a seat back provided to a rear portion of the seat cushion and configured to support a back of the user, and wherein the first region is located at rear central region of the rear portion of the seat cushion. 